Search: Posts Made By: Larry3215
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03-25-2015, 06:33 PM
Replies: 68
Views: 8,802
Posted By Larry3215

Almost forgot - sometimes when landing, you DO...

Almost forgot - sometimes when landing, you DO want extra lift from the flaps but DONT want the drag.

I keep talking about landing long and over shooting the target, but there will also be plenty...
03-25-2015, 06:21 PM
Replies: 68
Views: 8,802
Posted By Larry3215

Well, now you have two completely opposite...

Well, now you have two completely opposite recommendations from two "experts" - unknown drips under pressure :D

I keep expecting 5 or six others to jump in here and offer up additional conflicting...
03-25-2015, 08:02 AM
Replies: 68
Views: 8,802
Posted By Larry3215

Says the man who has never been in a boomer...

Says the man who has never been in a boomer thermal :D

Here is a log file from a 1 hr 52 minute flight of mine last year. The motor run was under 30 seconds for launch only. I spent those two...
03-25-2015, 05:13 AM
Replies: 68
Views: 8,802
Posted By Larry3215

Many sailplanes use full span 'flaperons'....

Many sailplanes use full span 'flaperons'. Virtually all DLG's and many 2 meter birds have full span ailerons that are also used as landing flaps.

If you dont have spoilers, then you need flaps...
03-25-2015, 05:08 AM
Replies: 68
Views: 8,802
Posted By Larry3215

On the Supra for example - 3.7 meter span - the...

On the Supra for example - 3.7 meter span - the camber change from full reflex to max camber for thermal turning is only 6mm of movement. Aileron deflection is 10mm max IIRC.

Flaps of course go...
03-25-2015, 02:16 AM
Replies: 68
Views: 8,802
Posted By Larry3215

Generally, for flaps/camber control especially,...

Generally, for flaps/camber control especially, its best to have them relatively wide. On my Supra for example the flaps vary from 22-24% of the cord starting at the center and going to the first...
03-14-2015, 04:51 PM
Replies: 68
Views: 8,802
Posted By Larry3215

Sounds like a plan :) Good luck and keep us...

Sounds like a plan :)

Good luck and keep us posted!
03-13-2015, 10:32 PM
Replies: 68
Views: 8,802
Posted By Larry3215

Remember one other thing - ALL of my advice is...

Remember one other thing - ALL of my advice is based on one very large and critical assumption.

Im assuming you will never, ever run the motor for more than 30 seconds at a time AND that you will...
03-13-2015, 10:24 PM
Replies: 68
Views: 8,802
Posted By Larry3215

By the way - I went through the same thing you...

By the way - I went through the same thing you are going through with MotoCalc when I first got into electrics back in the stone ages ;)

I have a little bit of an engineering back ground, so the...
03-13-2015, 10:18 PM
Replies: 68
Views: 8,802
Posted By Larry3215

I should point out some things about motocalc and...

I should point out some things about motocalc and other prediction software. NONE of them are perfect - and they never will be.

There are too many variables. No two motors are ever alike. If you...
03-13-2015, 10:13 PM
Replies: 68
Views: 8,802
Posted By Larry3215

You might try the demo version of Ecalc and see...

You might try the demo version of Ecalc and see what you think. Lots of people think its at leas as good, if not better than, motocalc.

http://www.ecalc.ch/indexcalc.htm

Keep in mind though...
03-13-2015, 04:52 PM
Replies: 68
Views: 8,802
Posted By Larry3215

Once again MotoCalc is wrong about that :) ...

Once again MotoCalc is wrong about that :)

MotoCalc is thinking normal flight conditions with sustained motor runs - not at all how you fly a powered sailplane.

You're only going to be running...
03-12-2015, 07:50 PM
Replies: 68
Views: 8,802
Posted By Larry3215

MotoCalc is way off on that. You're going to need...

MotoCalc is way off on that. You're going to need at least an 11x6 minimum or you will have an anemic climb. I really think you are going to need a 12x6 or 13x4 (depending on your battery packs) to...
03-10-2015, 05:19 AM
Replies: 68
Views: 8,802
Posted By Larry3215

Yup, you can slide it either way depending on...

Yup, you can slide it either way depending on your mounting option. The usual set screws.

Here is the data sheet for the Hyperion

http://www.hyperion-world.com/dn/zs/zs22.htm

and prop test...
03-10-2015, 12:58 AM
Replies: 68
Views: 8,802
Posted By Larry3215

By the way, I said this before, the Hyperion...

By the way, I said this before, the Hyperion motors are very nice motors. That one I linked to is on sale for a stupid low price, so dont discount it. Im running a Hyperion motor in my Supra now.
...
03-10-2015, 12:54 AM
Replies: 68
Views: 8,802
Posted By Larry3215

The Hackers are actually 57 grms, so only a 2 gm...

The Hackers are actually 57 grms, so only a 2 gm difference.

The Hyperion I linked to above is the 2213-22 model which has a lower kV and will need a larger prop.

Are you planning to use a...
03-09-2015, 05:48 AM
Replies: 68
Views: 8,802
Posted By Larry3215

ok, after a quick search I see guys have flown...

ok, after a quick search I see guys have flown them with 55 gram motors so you should be fine.
03-09-2015, 05:42 AM
Replies: 68
Views: 8,802
Posted By Larry3215

It occurs to me that I dont know squat about your...

It occurs to me that I dont know squat about your proposed model. If it is a "warmliner" then it may have been designed for a much larger/heavier power system.

If you take my advice on a small...
03-09-2015, 05:37 AM
Replies: 68
Views: 8,802
Posted By Larry3215

Here is a Hyperion thats on sale for a rediculous...

Here is a Hyperion thats on sale for a rediculous price that should work for you.

208 watts with a 12x6 prop on 3S. Or you could go with a 13x6 on 3S for 228 watts.

59 grams, 28mm diameter.
...
03-09-2015, 05:27 AM
Replies: 68
Views: 8,802
Posted By Larry3215

I think that Axi you have listed is still way...

I think that Axi you have listed is still way over kill. Thats a 400+ watt motor that weighs 161 grams and is 36mm diameter.

The motors Im using in the Bubble dancer and Mirage are 50 gram motors...
03-09-2015, 02:30 AM
Replies: 68
Views: 8,802
Posted By Larry3215

I dont know the model you have chosen, but you...

I dont know the model you have chosen, but you wont need all that much power for a strong climb. My Bubble Dancer and Supra both climb very nicely - more than enough for contest flying - on about...
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